Inset plate for electrodes of alkaline accumulators



March 16, 1954 c. H. o. LUBECK INSET PLATE FOR ELECTRODES OF ALKALINE ACCUMULATORS Filed June 2o,- 1950 latented Mar. 16, 1954 PATENT OFFICE 'cairirilaipgjossnn"iiiibeck,:stock olm, Sweden Appubatien Jiine 20', 1950,,S'erial'No'. 169,132

Claims priority, application Sweden June, 1949.

6 Claims. 1..

, The'present invention refers to electrodes fdr alkaline accumulatorsaccording to the 'mted States Patent No. 2,167,809; and relates particularly to the construction of the stiffening metal inset mentioned in said "patent and intended to improve theelectric conductivity; said metal inset being called core plate in th following. According to the invention, which will described with reference to the accompanying drawing, the core plate is intended to be made out of a thin metal band (of a thickness of approximately 0.1 mm.) of an arbitrary or a so-called endless length. Figs. 1-11 illustrate different manufacturing stages or steps in the manufacture of the core plate. Fig. 1 is a plan view of a piece of a corrugated band I and Fig. 2 is an elevation of the same piece of band. Fig. 3 is a plan view and Fig. 4 an elevation of the next manufacturing step. Figs. 5-11 are end views and elevations at an angle of 90 to the stages shown in Figs. 2 and 4 and illustrate different phases in the continued working of the longitudinally extending lateral edges of the corrugated band. Fig. 12 is a diagrammatically represented elevation of an arrangement for carrying the steps according to Figs. 1, 2 and Figs. 3, 4 into effect.

The thin metal band I, which might be preperforated, where-at the longitudinally extending lateral edges of the band have preferably been left non-perforated for a certain width, counted from the outer edges of the band, for instance as indicated at 13 in Fig. 1 (the perforated middle portion being designated by I4), is folded over the whole of its width between toothed rollers 15 and 15 in Fig. 12 (only the portions of the rollers bearing on each other being shown) of the same or a somewhat greater width than that of the band. The band thus corrugated is then introduced between the rollers H, 18, which are toothed in the middle section corresponding to the perforated portion of the band to the same tooth shape as that of the rollers I5, 15, but the ends of the rollers corresponding to the non-perforated edges of the band are smooth and made to a diameter such that compression or jamming-in of the folds of the longitudinally extending lateral edges of the band takes place simultaneously with the engagement of the toothed middle portion of the rollers into the folds, which are thus filled and prevented from being jammed in or deformed, the engagement of the teeth of the rollers l1, 18 being adapted to be synchronized with the corrugation in the rollers l 5, 16. Fig. 13 shows the rollers I1. 18 in an elevation at an angle of 90 to the projection shown in Fig. 12 and to a smaller scale than the latter.

A further embodiment of the arrangementfor carrying the manufacturing steps according to Figs. *1, 2 and Figs. 3, 4 intoeffect is shown diagrammaticallyinFig. 14. The corrugation or the engagement into the folds and the jamming-in of, thee'dges is here, intended to take place by means of. toothed jaws, which are opened and closed, for instance by eccentrics, on both sides of the band. In the operation, which in Fig. 12 is intended to be carried into effect by the rollers if, I8 the respective jaws are preferably, as shown diagrammatically in Fig. 14, made with a resilient member 21, 22, which is movable in the respective jaws i9, 20 and engages into the corrugations immediately before the jamming-in of the edges of the band occurs at the continued movement of the jaws toward one another. If desired, the first operation according to Fig. 12 may be performed, as indicated above, by means of toothed rollers, while the second operation is performed by means of jaws, or possibly vice versa. The manufacturing status thus imparted to the core plate corresponds to that shown in Figs. 3 and 1, where the corrugated portion is denoted by 23 and the jammed-in edges by 24.

After this manufacturin stage, the folded or corrugated band with its jammed-in lateral edges might preferably continue in an immediate sequence in a machine combined with the former machine and synchronized therewith, for instance through the requisite number of pairs of rollers, where the jammed-in longitudinal lateral edges of the band are in a manner known per se subjected to a series of folding operations, for instance as shown in Figs. 6-11.

With the use of the core plate in the manner aimed at, that is to say, as an inset in the electrode lengths, the ridges of the corrugation will be upset, in the manufacturing method devised for the electrode lengths, in the intended positions for the insulating rods on the electrodes (indicated at 25 in Fig. 11), as will be apparent from the previously mentioned patent, whereby, simultaneously with the compression of the enclosed electrode mass in these rod positions, a rigid bed is formed for the insulating rods, which is desirable and perfectly consistent with the constructive principle forming the basis of the accumulator construction according to the previously mentioned patent and the United States Patent No. 1,785,202.

I claim;

1. A method of manufacturing electrode core plates for electrical accumulators consisting in folding a thin metal band transversely of its entire length, so as to form corrugations of a uniform height throughout the width of the band, and forming fiat rim portions by jamming and flattening out the corrugations along both sides of the band whereby adjacent corrugations overlap to strengthen the rim portions, while holding the middle portion of the band so as to prevent deformation of the corrugations between said rim portions.

2. A method as defined in claim 1, in which the middle portion of the band is supported during the jamming operation between members having teeth filling and stiffening the corrugations.

3. A method as claimed in claim 2, in which the band is first passed between toothed rollers to form the corrugations and then moved between toothed rollers engaging the middle portion of the band and having cylindrical end portions for flattening the rim portions of the band.

4. An electrode core plate for electrical accumulators consisting of a metal band provided with transverse corrugations of a uniform height, and flat rim portions along both sides of the band in which the ends of the corrugations are jammed and flattened out by being bent transversely of the corrugations, whereby adjacent corrugations overlap to strengthen the rim portions and the corrugations of the band intermediate the rim portions being of uniform height throughout the extent of the band portions intermediate the rim portions.

5. A method as defined in claim 1 including the additional step of folding the rim portions along longitudinal lines of the band to further strengthen such rim portions.

6. An electrode core plate as defined in claim 4 in which said rim portions are folded along longitudinal lines of the band to further strengthen such rim portions.

CARL HILDING QSSIAN LUBECK.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 2,167,809 Lubeck June 10, 1936 FOREIGN PATENTS Number Country Date 104,365 Sweden .Apr. 28, 1942 

